need slant 4 barrel help 170 225

Hello I have a 64 valiant with a 170 in it. I bought clifford 4 barrel intake and split header only to find the headers wont fit the 170. So can I use the clifford intake with the dutra duals?? Or am I in for more trouble??
Also I am looking to buy a 225 off a member of fabo what will it take to swap to the 225 as the 225 was an auto and my 170 has a a-833 behind it.
I want to stay with the manual trans.

And can someone confirm that the clifford headers wont work with the 170

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